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Circuit Optimization and Vibration Analysis of Electromagnetic Energy Harvesting Systems

[+] Author Affiliations
Lei Zuo, Xiudong Tang

State University of New York at Stony Brook, Stony Brook, NY

Paper No. DETC2009-87728, pp. 531-537; 7 pages
doi:10.1115/DETC2009-87728
From:
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME

abstract

In this paper we investigate an electrical circuit and its optimization for vibration energy harvesting using electromagnetic transducer. A step-up DC-DC converter regulated by Pulse-Width Modulation (PWM) is used to boost the voltage and control the power flow. An analytical expression for the optimal power flow from the rectified electromagnetic harvester is derived as a function of PWM duty cycle, vibration amplitude and frequency. Optimal duty cycles for both continuous and discontinuous modes are obtained analytically. The impedance of electromagnetic transducer and forward voltage drop of the diodes have been taken into account. It is also interesting to note that if a large inductor is adopted between the rectifier and step-up DC-DC converter, the energy harvesting system will exactly have the effect of Coulomb friction damper.

Copyright © 2009 by ASME

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